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‪The relations between scientific and artistic fields are not recent, but they have experienced a recent resurgence under the name “art-science”. They have evolving contours, between quotes or reciprocal borrowings and devices intended to promote co-productions. These co-productions are today the most frequent model of cooperation between actors that everything seems, in appearance, to oppose. The concrete forms and the discourses of promises that characterize them are multiple and evolve according to the issues and strategies of the actors who carry them and the institutions that support them. They are analyzed here from three angles: the logics of actors, the formal characteristics of artistic productions and the conceptions of mediation that underlie them.‪